Title
Temperature sensitivity of soil enzymes along an elevation gradient in the Peruvian Andes
Date Issued
01 February 2016
Access level
open access
Resource Type
journal article
Author(s)
Nottingham A.T.
Turner B.L.
Whitaker J.
Ostle N.
Bardgett R.D.
McNamara N.P.
Meir P.
Publisher(s)
Springer International Publishing
Abstract
Soil enzymes are catalysts of organic matter depolymerisation, which is of critical importance for ecosystem carbon (C) cycling. Better understanding of the sensitivity of enzymes to temperature will enable improved predictions of climate change impacts on soil C stocks. These impacts may be especially large in tropical montane forests, which contain large amounts of soil C. We determined the temperature sensitivity (Q10) of a range of hydrolytic and oxidative enzymes involved in organic matter cycling from soils along a 1900 m elevation gradient (a 10 °C mean annual temperature gradient) of tropical montane forest in the Peruvian Andes. We investigated whether the activity (Vmax) of selected enzymes: (i) exhibited a Q10 that varied with elevation and/or soil properties; and (ii) varied among enzymes and according to the complexity of the target substrate for C-degrading enzymes. The Q10 of Vmax for β-glucosidase and β-xylanase increased with increasing elevation and declining mean annual temperature. For all other enzymes, including cellobiohydrolase, N-acetyl β-glucosaminidase and phosphomonoesterase, the Q10 of Vmax did not vary linearly with elevation. Hydrolytic enzymes that degrade more complex C compounds had a greater Q10 of Vmax, but this pattern did not apply to oxidative enzymes because phenol oxidase had the lowest Q10 value of all enzymes studied here. Our findings suggest that regional differences in the temperature sensitivities of different enzyme classes may influence the terrestrial C cycle under future climate warming.
Start page
217
End page
230
Volume
127
Issue
March 2
Language
English
OCDE Knowledge area
Ciencia del suelo
Forestal
Ciencias del medio ambiente
Subjects
Scopus EID
2-s2.0-84959479625
Source
Biogeochemistry
ISSN of the container
01682563
Sponsor(s)
This study is a product of the Andes Biodiversity and Ecosystem Research Group consortium ( www.andesconservation.org ) and was financed by the UK Natural Environment Research Council (NERC) (grant numbers NE/G018278/1, NE/F002149/1), and also supported by ARC grant FT110100457 to PM and a European Union Marie-Curie Fellowship FP7-2012-329360 to ATN. We thank the Asociacion para la Conservacion de la Cuenca Amazonica (ACCA) in Cusco and the Instituto Nacional de Recursos Naturales (INRENA) in Lima for access to the study sites. For their logistical support we thank Dr. Eric Cosio and Eliana Esparza Ballón at Pontificia Universidad Católica del Perú (PUCP). For their support in the laboratory we thank Tania Romero and Dayana Agudo. For their support in the field we thank Adan J.Q. Ccahuana, Walter H. Huasco, Javier E. S. Espejo and many others too numerous to mention here.
Sources of information:
Directorio de Producción Científica
Scopus